# Is this adjustment realistic?

**URL:** <https://wahoox.forum.wahoofitness.com/t/is-this-adjustment-realistic/31468>\
**Category:** Uncategorized\
**Created:** [June 18, 2026, 9:04pm UTC](https://wahoox.forum.wahoofitness.com/t/is-this-adjustment-realistic/31468 "2026-06-18T21:04:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Critmark](https://sea2.discourse-cdn.com/flex020/user_avatar/wahoox.forum.wahoofitness.com/critmark/32/11594_2.png) [@Critmark](https://wahoox.forum.wahoofitness.com/u/Critmark)\
**Post date:** [June 18, 2026, 9:04pm UTC](https://wahoox.forum.wahoofitness.com/t/is-this-adjustment-realistic/31468/1 "2026-06-18T21:04:41Z")

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I was riding on another platform (I won’t mention Fulgaz) and the road changed from paved to brick. I am not talking about 100 year old cobbles, but modern tight fitting flat smooth bricks. At the identical gradient, cadence, and power output in watts, the speed was 3-4+ mph slower. Now I don’t ride on that here in Utah (or when I was in California) so I have no first hand experience. But there are a lot of rides in Europe that have this terrain. Is this actually the speed cost based solely on moving from paved road to brick?

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**Author:** ![Steve\_Q](https://sea2.discourse-cdn.com/flex020/user_avatar/wahoox.forum.wahoofitness.com/steve_q/32/2318_2.png) [@Steve\_Q](https://wahoox.forum.wahoofitness.com/u/Steve_Q)\
**Post date:** [June 18, 2026, 10:15pm UTC](https://wahoox.forum.wahoofitness.com/t/is-this-adjustment-realistic/31468/2 "2026-06-18T22:15:40Z")

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I agree with you. The difference between smooth asphalt to smooth brick in real life is only a couple of km/h, about half of what you wrote.

Smooth asphalt to cobbles, on the other hand, is a whole different story. There are vast differences in quality of cobbles which can make it hard to generalize, but you can expect a difference of 10 kph / 6 mph or more.